var sBrowser = new String(navigator.userAgent);
var sApp = new String(navigator.appName);

var sCss = "css/oph.css";
var sCss_Win_IE4 = "css/oph.css";
var sCss_Win_IE5 = "css/oph.css";
var sCss_Win_IE6 = "css/oph.css";
var sCss_Win_NN4 = "css/oph_ns.css";
var sCss_Mac_IE4 = "css/oph.css";
var sCss_Mac_IE5 = "css/oph.css";
var sCss_Mac_IE6 = "css/oph.css";
var sCss_Mac_NN4 = "css/oph_ns.css";
var sCss_Win_NS6 = "css/oph.css";
var sCss_Mac_NS6 = "css/oph.css";

if (sBrowser.indexOf("Win") != -1) {
  if (sBrowser.indexOf("MSIE 4") != -1)
    sCss = sCss_Win_IE4;
  else if (sBrowser.indexOf("MSIE 5") != -1)
    sCss = sCss_Win_IE5;
	else if (sBrowser.indexOf("MSIE 6") != -1)
    sCss = sCss_Win_IE6;
  else if (sBrowser.indexOf("Netscape") != -1)
    sCss = sCss_Win_NS6;
  else if ((sApp.indexOf("Netscape") != -1) && (sBrowser.indexOf("Opera") == -1) && (sBrowser.indexOf("Mozilla/4") != -1))
    sCss = sCss_Win_NN4;
}
else {
  if (sBrowser.indexOf("MSIE 4") != -1)
    sCss = sCss_Mac_IE4;
  else if (sBrowser.indexOf("MSIE 5") != -1)
    sCss = sCss_Mac_IE5;
	 else if (sBrowser.indexOf("MSIE 6") != -1)
    sCss = sCss_Mac_IE6;
  else if (sBrowser.indexOf("Netscape") != -1)
    sCss = sCss_Mac_NS6;
  else if ((sApp.indexOf("Netscape") != -1) && (sBrowser.indexOf("Opera") == -1) && (sBrowser.indexOf("Mozilla/4") != -1))
    sCss = sCss_Mac_NN4;
}

document.write("<link rel='stylesheet' href='" + sCss + "' type='text/css'>");